Gravels and Substrates

Gravel, Peadensity is equal to 1788 kg/m³ or 111.621 lb/ft³ with specific gravity of 1.788 relative to pure water. Calculate how much of this gravel is required to attain a specific depth in a cylinder, quarter cylinder or in a rectangular shaped aquarium or pond

What is carat?

What is angle measurement?

An angle, in geometry, is defined by two rays a and b sharing a common starting point S, called the vertex. These rays can be transformed into each other by a revolution or rotation. The amount of rotation defines size of the angle (a,b) or α (the Greek letter).read more...»